JPH05280687A - Apparatus for thermal power plant and nuclear power plant - Google Patents
Apparatus for thermal power plant and nuclear power plantInfo
- Publication number
- JPH05280687A JPH05280687A JP3061593A JP6159391A JPH05280687A JP H05280687 A JPH05280687 A JP H05280687A JP 3061593 A JP3061593 A JP 3061593A JP 6159391 A JP6159391 A JP 6159391A JP H05280687 A JPH05280687 A JP H05280687A
- Authority
- JP
- Japan
- Prior art keywords
- coating
- power plant
- thermal power
- fluid
- nuclear power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C21/00—Apparatus or processes specially adapted to the manufacture of reactors or parts thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
- F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
- F16L58/04—Coatings characterised by the materials used
- F16L58/08—Coatings characterised by the materials used by metal
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C13/00—Pressure vessels; Containment vessels; Containment in general
- G21C13/08—Vessels characterised by the material; Selection of materials for pressure vessels
- G21C13/087—Metallic vessels
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は火力、原子力発電プラン
トの湿り蒸気系統、給・復水系統、ドレン系統を構成す
る炭素鋼製機器（配管及びその付属機器である各種弁）
のエロージョン・コロージョンによる減肉発生を防止し
た同プラント用機器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to carbon steel equipment (piping and various valves that are its accessories) constituting a thermal power system, a wet steam system of a nuclear power plant, a feed / condensate system, and a drain system.
Related to the equipment for the plant that prevents the occurrence of wall thinning due to erosion and corrosion.
【０００２】[0002]
【従来の技術】火力、原子力発電プラントの湿り蒸気系
統、給・復水系統、ドレン系統で使用される機器、例え
ば配管や仕切弁、玉形弁、逆止弁等の各種弁の構成部品
の材料としては炭素鋼（鍛鋼、鋳鋼）が多く使用されて
いる。それら機器の流体の流動と接する部品を炭素鋼で
製作した場合、前記各部品の流体の流動と接する表面で
エロージョン・コロージョンが発生し、プラントの運用
長期化に伴って、エロージョン・コロージョンによる減
肉が進展して不都合が発生するケースが多くなってい
る。2. Description of the Related Art Equipment used in thermal power, wet steam systems of nuclear power plants, supply / condensation systems, drain systems, for example, components of various valves such as pipes, sluice valves, ball valves, and check valves. Carbon steel (forged steel, cast steel) is often used as a material. When the parts that come into contact with the fluid flow of these equipment are made of carbon steel, erosion corrosion occurs on the surface that comes into contact with the fluid flow of each of the above parts, and with the prolonged operation of the plant, thinning due to erosion corrosion There are many cases in which inconvenience occurs due to the progress of.
【０００３】そのため火力、原子力発電プラントの湿り
蒸気系統、給・復水系統、ドレン系統で使用される機器
は、定期的に開放点検を実施して、プラント運用に支障
を来すようなエロージョン・コロージョンによる減肉の
進展がないことを確認する必要があり、減肉の進展が設
計上許容される域を越える可能性がある場合、事前に減
肉の進展している部位の溶接による肉盛補修を行うか、
部品の取替を行っている。Therefore, equipment used in a thermal power plant, a wet steam system of a nuclear power plant, a supply / condensation system, and a drain system is regularly subjected to an open inspection to prevent erosion. It is necessary to confirm that there is no progress in metal loss due to corrosion, and if there is a possibility that the progress of metal thinning will exceed the design allowable range, the surfacing by welding the part where the metal thinning is progressing in advance. Repair or
Parts are being replaced.
【０００４】又、減肉の進展速度が大であって、溶接に
よる肉盛補修や部品の取替を行う頻度が高くなる場合に
は、前記各部品を炭素鋼よりも耐エロージョン・コロー
ジョン性の高いＣｒＭｏ鋼又はオーステナイト系ステン
レス鋼を使用して製作し直している。In addition, when the rate of progress of metal thinning is high and the frequency of overlay repair by welding or replacement of parts is high, each of the above parts is more resistant to erosion / corrosion than carbon steel. It is remade using high CrMo steel or austenitic stainless steel.
【０００５】[0005]
【発明が解決しようとする課題】火力、原子力発電プラ
ントの湿り蒸気系統、給・復水系統、ドレン系統を構成
する炭素鋼製の機器は膨大な物量であり、個々の機器を
定期的にＵＴにより点検を実施して、減肉の進展してい
る部位の溶接による肉盛補修や部品の取替を行った場
合、その費用は膨大なものとなる。又、各機器を炭素鋼
よりも耐エロージョン・コロージョン性の高いオーステ
ナイト系ステンレス鋼を使用して製作した場合、材料コ
ストが数倍となるために非経済的である。The carbon steel equipment constituting the thermal power, the wet steam system of the nuclear power plant, the feed / condensation system, and the drain system is an enormous quantity, and the individual equipment is regularly UT. If the inspection is carried out by, and the overlaying repair and the replacement of parts are performed by welding the part where the thickness reduction is progressing, the cost will be enormous. Further, when each device is manufactured by using austenitic stainless steel having higher erosion / corrosion resistance than carbon steel, the material cost becomes several times, which is uneconomical.
【０００６】本発明は上記技術水準に鑑み、エロージョ
ン・コロージョンによる減肉の発生しない火力、原子力
発電プラント用機器を提供しようとするものである。In view of the above-mentioned state of the art, the present invention is intended to provide a thermal power plant and a nuclear power plant equipment in which wall thinning due to erosion and corrosion does not occur.
【０００７】[0007]
【課題を解決するための手段】本発明は （１）湿り蒸気系統、給・復水系統、ドレン系統を構成
する火力、原子力発電プラント用機器において、流体と
接する各機器の表面に系統中を流動する流体に対して化
学的に安定な金属又はセラミックの被膜を形成してなる
ことを特徴とする火力、原子力発電プラント用機器。Means for Solving the Problems The present invention is (1) in a steam power system, a feed / condensate system, a thermal power constituting a drain system, or a device for a nuclear power plant, a system is provided on the surface of each device in contact with a fluid. An apparatus for thermal power and nuclear power plants, which is formed by forming a metal or ceramic coating that is chemically stable against a flowing fluid.
【０００８】（２）系統中を流動する流体が脱気純水の
場合、Ｎｉ−Ｃｒの下層被膜及びＷＣ＋Ｎｉ−Ｃｒの上
層被膜を大気プラズマ溶射により形成してなることを特
徴とする上記１記載の火力、原子力発電プラント用機
器。(2) When the fluid flowing in the system is degassed pure water, the Ni-Cr lower layer coating and the WC + Ni-Cr upper layer coating are formed by atmospheric plasma spraying. Thermal power, equipment for nuclear power plants.
【０００９】（３）系統中を流動する流体が脱気純水の
場合、ＷＣ＋Ｃｏ又はＷＣ＋ＮｉＣｒの単相被膜を高エ
ネルギガス溶射法であるジェットコート溶射により形成
してなることを特徴とする上記１記載の火力、原子力発
電プラント用機器。(3) When the fluid flowing in the system is degassed pure water, a single-phase coating of WC + Co or WC + NiCr is formed by jet coat spraying which is a high energy gas spraying method. The listed thermal power and nuclear power plant equipment.
【００１０】（４）系統中を流動する流体が脱気純水の
場合、オーステナイト系ステンレス鋼の単相被膜を高エ
ネルギガス溶射法であるダイヤモンドジェット溶射によ
り形成してなることを特徴とする上記１記載の火力、原
子力発電プラント用機器。である。(4) When the fluid flowing in the system is deaerated pure water, a single-phase coating of austenitic stainless steel is formed by diamond jet spraying which is a high energy gas spraying method. 1. Thermal power and nuclear power plant equipment described in 1. Is.
【００１１】本発明にいう火力、原子力発電プラント用
機器とは、湿り蒸気系統、給・復水系統、ドレン系統で
使用する配管や仕切弁、玉形弁、逆止弁などの弁箱、弁
座、弁体などを意味する。The equipment for thermal power and nuclear power plants referred to in the present invention is a valve box or valve such as a pipe or a sluice valve, a globular valve or a check valve used in a wet steam system, a feed / condensate system or a drain system. It means a seat, a valve body, etc.
【００１２】[0012]
【作用】図７、図８及び図９により、本発明の作用につ
いて説明する。図７は、火力、原子力発電プラントの湿
り蒸気系統、給・復水系統、ドレン系統で使用される各
種機器の内部で発生するエロージョン・コロージョンの
発生メカニズムを示す図である。The operation of the present invention will be described with reference to FIGS. 7, 8 and 9. FIG. 7 is a diagram showing a generation mechanism of erosion / corrosion generated in various equipment used in a thermal power plant, a wet steam system of a nuclear power plant, a feed / condensate system, and a drain system.
【００１３】炭素鋼等Ｆｅを主要元素とする金属の表面
を火力、原子力発電プラントで使用される脱気純水が流
動する場合、金属の表面には、Ｆｅの酸化によってＦｅ
3 Ｏ 4 の被膜が生成されており、更にＦｅ3 Ｏ4 の被膜
と脱気純水との間には、液境膜が存在していて、次式に
示す化学反応が起こっている。Surface of metal containing Fe as a main element such as carbon steel
Degassed pure water used in nuclear power plants
When moving, the surface of the metal may be Fe
3O FourA film of3OFourCoating
There is a liquid boundary film between the degassed pure water and degassed pure water.
The chemical reaction shown is occurring.
【化１】 [Chemical 1]
【００１４】この化学反応式（１）において、右向きの
反応はＦｅ3 Ｏ4 の還元溶解によるＦｅ2+の脱気純水中
への流出であり、左向きの反応はＦｅ3 Ｏ4 の析出であ
る。脱気純水が流動する場合には、右向きの反応が促進
される傾向にある。右向きの反応によってＦｅ2+が脱気
純水中へ流出して、Ｆｅ3 Ｏ4 の被膜が失われると、Ｆ
ｅの酸化によって新たなＦｅ3 Ｏ4 が生成され補われ
る。以上の化学的作用＋物理的作用の繰返しによって、
金属が時間と共に侵食される現象をエロージョン・コロ
ージョンと呼んでいる。In the chemical reaction formula (1), the reaction to the right is the outflow of Fe 2+ into degassed pure water by reducing and dissolving Fe 3 O 4 , and the reaction to the left is the precipitation of Fe 3 O 4 . is there. When degassed pure water flows, the reaction to the right tends to be promoted. When Fe 2+ flows out into degassed pure water due to the rightward reaction and the Fe 3 O 4 coating film is lost, F
Oxidation of e produces and supplements new Fe 3 O 4 . By repeating the above chemical action + physical action,
The phenomenon that metal erodes over time is called erosion-corrosion.
【００１５】エロージョン・コロージョンによって金属
が侵食される現象を、液境膜の内部をＦｅ3 Ｏ4 の溶解
還元によって生成されるＦｅ2+が移動する現象であると
考えた場合、その進行速度は次式によって表わされる。 ｄｍ／ｄｔ＝Ｋ（Ｃｓ−Ｃｂ） Ｋ＝Ｄ／δ ここに、ｄｍ／ｄｔはＦｅ2+イオンの脱気純水中への移
動速度、Ｋは物質移動係数、Ｃｓ，ＣｂはＦｅ3 Ｏ4 表
面及び液境膜でのＦｅ2+イオン濃度、Ｄは液膜境膜内で
のＦｅ2+イオン拡散係数、δは液境膜の厚さである。When the phenomenon of metal erosion due to erosion-corrosion is considered to be the phenomenon of movement of Fe 2+ generated by dissolution reduction of Fe 3 O 4 inside the liquid boundary film, the rate of progress thereof is It is expressed by the following equation. dm / dt = K (Cs-Cb) K = D / δ where dm / dt is the moving speed of Fe 2+ ions into degassed pure water, K is the mass transfer coefficient, and Cs and Cb are Fe 3 O. 4 Fe 2+ ion concentration on the surface and liquid boundary film, D is the Fe 2+ ion diffusion coefficient in the liquid film boundary film, and δ is the thickness of the liquid film.
【００１６】エロージョン・コロージョンによって金属
が侵食される速度を低減するためには、前記式中のＦｅ
3 Ｏ4 表面のＦｅ2+イオン濃度Ｃｓを小さくするか、又
は液境膜の厚さδを大きくすることが有効な方法であ
る。In order to reduce the rate at which the metal is eroded by erosion-corrosion, Fe in the above equation is used.
An effective method is to reduce the Fe 2+ ion concentration Cs on the surface of 3 O 4 or increase the thickness δ of the liquid boundary film.
【００１７】前者の方法を実現する手段としては、図８
に示すように金属へのＣｒ等の添加により、金属の表面
にＦｅ3 Ｏ4 の被膜の代りに不動態の被膜を生成して、
前記の化学反応が起こらないようにする。すなわち、従
来の技術で述べたように、部品の材料そのものを炭素鋼
よりも耐エロージョン・コロージョン性の高いオーステ
ナイト系ステンレス鋼にすることが一般的である。但
し、本発明が解決しようとする課題でも述べたように、
オーステナイト系ステンレス鋼は炭素鋼と比較して材料
コストが数倍となるために非経済的である。As means for realizing the former method, FIG.
As shown in, by adding Cr or the like to the metal, a passive film is formed on the surface of the metal instead of the film of Fe 3 O 4 ,
Avoid the above chemical reactions. That is, as described in the related art, it is general that the material of the component itself is austenitic stainless steel having higher erosion / corrosion resistance than carbon steel. However, as described in the problem to be solved by the present invention,
Austenitic stainless steel is uneconomical because its material cost is several times that of carbon steel.
【００１８】一方、後者の方法を実現する手段として
は、液境膜そのものの厚さは容易にコントロールするこ
とができないので図９に示すように液境膜の代りに、金
属の表面にＦｅ以外を主要元素とする金属又はセラミッ
クの被膜を設け、これを境膜とする、すなわち本発明に
おける系統中を流動する流体に対して、化学的に安定し
た金属又はセラミックの被膜を流体の流動と接する表面
に形成することが得策である。On the other hand, as a means for realizing the latter method, the thickness of the liquid boundary film itself cannot be easily controlled. Therefore, as shown in FIG. A metal or ceramic coating containing as a main element is provided as a boundary film, that is, a chemically stable metal or ceramic coating is brought into contact with a fluid flow in a fluid flowing in the system of the present invention. It is a good idea to form it on the surface.
【００１９】更に、本発明において、系統中を流動する
流体に対して化学的に安定した金属の被膜の主要元素に
Ｃｒ等を添加することにより前者の方法による効果も同
時に期待することができる。Furthermore, in the present invention, the effect of the former method can be expected at the same time by adding Cr or the like to the main element of the metal coating that is chemically stable to the fluid flowing in the system.
【００２０】なお、本発明において適用する金属又はセ
ラミックの被膜の種類としては、次の通りであり、これ
らはいずれも脱気純水に対して化学的に安定しているも
のであることを脱気純水中での浸漬試験によって確認済
のものである。The types of metal or ceramic coatings used in the present invention are as follows, and it is assumed that all of these are chemically stable against degassed pure water. It has been confirmed by an immersion test in pure water.
【００２１】 Ｎｉ−Ｃｒ下層被膜／ＷＣ＋Ｎｉ−Ｃ
ｒ上層被膜（大気プラズマ溶射） Ｎｉ−Ｃｒ下層被膜はＮｉ：Ｃｒ＝８０：２０の組成の
ものが溶射時加熱によって溶融し易く、母材と溶融結合
することによって十分な付着強度が得られるので下地被
膜として好ましく、ＷＣ＋Ｎｉ−Ｃｒ上層被膜としてＷ
Ｃを使用するのは耐腐食性、耐壊食性に優れているため
に使用するもので、ＷＣのみでは溶融し難いのでＮｉ−
Ｃｒを粒子間結合材として添加しているものである。一
般的にＷＣ：Ｎｉ−Ｃｒ＝１：２近傍の場合が強度が大
であるので特に好ましい。Ni-Cr lower layer coating / WC + Ni-C
r Upper layer coating (atmospheric plasma spraying) The Ni-Cr lower layer coating having a composition of Ni: Cr = 80: 20 is easily melted by heating during thermal spraying, and sufficient bond strength can be obtained by fusion bonding with the base material. Preferred as an undercoat, W as a WC + Ni-Cr upper coating
C is used because it is excellent in corrosion resistance and erosion resistance, and it is difficult to melt with WC alone.
Cr is added as an inter-particle binder. In general, the case where WC: Ni-Cr = 1: 2 is particularly preferable because the strength is high.
【００２２】また、下層被膜、上層被膜を設けるに際し
ては、まず機器表面母材に十分な付着強度を得ることが
できるＮｉ−Ｃｒ下層被膜を全被膜の１／３程度設け、
その上にＷＣを含むＮｉ−Ｃｒ被膜を設けるのがよい。
これによって母材、下層被膜、上層被膜間の強固な結合
状態が得られ、特に上層被膜中のＷＣがもつ流体に対す
る耐腐食性、耐壊食性を十分に活かすことができる。す
なわち、下層被膜：上層被膜の膜厚比は約１：２が最適
である。When the lower layer coating and the upper layer coating are provided, first, the Ni-Cr lower layer coating capable of obtaining a sufficient adhesion strength to the equipment surface base material is provided about 1/3 of the total coating,
It is preferable to provide a Ni—Cr coating containing WC thereon.
As a result, a strong bonding state between the base material, the lower layer coating and the upper layer coating can be obtained, and in particular, the corrosion resistance and erosion resistance of the WC in the upper layer coating with respect to the fluid can be fully utilized. That is, the optimum thickness ratio of the lower layer coating to the upper layer coating is about 1: 2.
【００２３】 ＷＣ＋Ｃｏ又はＷＣ＋Ｎｉ−Ｃｒ単相
被膜（ジェットコート溶射） ＷＣは溶射時加熱によって溶融しにくいのでＣｏ又はＮ
ｉ−Ｃｒを粒子間結合材として添加する。溶射を大気プ
ラズマ溶射よりもＷＣの溶融率を大幅に向上することが
できるジェットコート（Jet Kote) 溶射によるので、Ｗ
Ｃに混入するＣｏ又はＮｉ−Ｃｒは少量でよく、８８Ｗ
Ｃ＋１２Ｃｏ，８８ＷＣ＋１２Ｎｉ−Ｃｒが最適であ
る。WC + Co or WC + Ni—Cr Single Phase Coating (Jet Coat Spraying) Since WC does not easily melt by heating during spraying, Co or N
i-Cr is added as an interparticle binder. Since the spraying is by jet coating (Jet Kote) spraying, which can significantly improve the melting rate of WC compared with atmospheric plasma spraying,
A small amount of Co or Ni-Cr mixed in C is required, 88W
C + 12Co and 88WC + 12Ni-Cr are optimal.
【００２４】ジェットコート溶射法とは、高エネルギガ
ス溶射法であり、マッハ５前後の極超音速ジェット燃焼
ガスにより極めてシャープで高密度の粉末溶射ができる
溶射法である。The jet coat spraying method is a high-energy gas spraying method, and is a spraying method capable of performing extremely sharp and high-density powder spraying with hypersonic jet combustion gas around Mach 5.
【００２５】 オーステナイト系ステンレス鋼（ダイ
ヤモンドジェット溶射） 重量％で、Ｎｉ：１０〜１４％、Ｃｒ：１６〜１８％、
Ｍｏ：２〜３％、Ｆｅ：残部の組成を有するＳＵＳ３１
６相当のオーステナイト系ステンレス鋼を高エネルギガ
ス溶射の一つであるダイヤモンドジェット溶射法によっ
て溶射する。Austenitic stainless steel (diamond jet spraying)% by weight, Ni: 10-14%, Cr: 16-18%,
SUS31 having a composition of Mo: 2 to 3% and Fe: balance
Austenitic stainless steel equivalent to 6 is sprayed by the diamond jet spraying method which is one of high energy gas spraying.
【００２６】ダイヤモンドジェット（Diamond Jet)溶射
は高い運動エネルギと熱量の制御により密度が高く多孔
性でない被膜を形成し、高い密着力を示すと共に優れた
仕上り面を形成する溶射法である。Diamond Jet thermal spraying is a thermal spraying method that forms a highly dense and non-porous coating by controlling high kinetic energy and heat quantity, exhibits high adhesion, and forms an excellent finished surface.
【００２７】[0027]
（例１）本発明を火力、原子力発電プラント用配管に適
用した実施例について説明する。図１はエルボに適用し
た場合、図２は分岐管に適用した場合及び図３はコント
ロール弁下流側配管に適用した場合の各実施例の説明図
であり、斜線部が本発明の被膜を形成させた部位であ
る。(Example 1) An example in which the present invention is applied to piping for thermal power and nuclear power plants will be described. FIG. 1 is an illustration of each embodiment when applied to an elbow, FIG. 2 is applied to a branch pipe, and FIG. 3 is an illustration of each embodiment when applied to a control valve downstream side pipe, and a hatched portion forms a coating film of the present invention. It is the part that made it.
【００２８】火力、原子力発電プラントの湿り蒸気系
統、給・復水系統、ドレン系統で使用される炭素鋼配管
において発生するエロージョン・コロージョンによる減
肉は、主としてエルボ、ベンド、分岐管、合流管等の曲
り流れを形成する配管と、その下流側に付設される配管
口径の約２倍の長さの範囲の直管、ならびにコントロー
ル弁、オリフィス等の絞り流れを形成する部品の下流側
に付設される配管で多く経験されている。The thinning due to erosion and corrosion that occurs in carbon steel piping used in thermal power, wet steam system of nuclear power plant, feed / condensation system, drain system is mainly due to elbow, bend, branch pipe, confluence pipe, etc. Which forms the curved flow of the pipe, a straight pipe having a length of about twice the pipe diameter attached to the downstream side thereof, and a control valve, an orifice or the like which is attached downstream of the component forming the throttle flow. Experienced with various piping.
【００２９】従って、新たに設置されるところの系統を
構成する配管のエロージョン・コロージョンによる減肉
の進展を抑制するための対策を講ずる場合、前記のエロ
ージョン・コロージョンによる減肉が多く経験されてい
る各種の配管部品だけを対象として、その内面にあらか
じめ本発明の金属又はセラミックの被膜を形成しておく
ことが、より効果的かつ経済的な方法である。Therefore, when taking measures to suppress the progress of the wall thinning due to erosion / corrosion of the piping constituting the system to be newly installed, the aforementioned wall thinning due to erosion / corrosion is often experienced. It is a more effective and economical method to preliminarily form the metal or ceramic coating of the present invention on the inner surface of only various piping components.
【００３０】又、既設品であって、ある程度減肉が進展
している部位の表面に、本発明の金属又はセラミックの
被膜を形成することにより、それ以上減肉が進展しない
ようにすることもでき、既設の部品をそのまま流用でき
ることから低コストの補修を行うこともできる。It is also possible to prevent the metal thinning from further progressing by forming the metal or ceramic coating of the present invention on the surface of the existing part where the metal thinning has progressed to some extent. Since the existing parts can be used as they are, low-cost repair can be performed.
【００３１】図１〜図３の斜線部には大気プラズマ法
による８０Ｎｉ−２０Ｃｒ下層被膜０．２ｍｍとＷＣ＋
８０Ｎｉ−２０Ｃｒ（ＷＣ：Ｎｉ−Ｃｒ＝１：２）上層
被膜０．４ｍｍ、ジェットコート法による８８ＷＣ＋
１２Ｃｏ被膜０．１５ｍｍ又は８８ＷＣ＋１２Ｎｉ−Ｃ
ｒ被膜０．１５ｍｍ、ダイヤモンドジェット法による
ＳＵＳ３１６被膜０．４ｍｍのいずれの被膜を形成する
ことによっても、その目的が達成できる。1 to 3, the shaded portions in FIGS. 1 to 3 are formed by an atmospheric plasma method and have a NiNiCr lower layer coating of 0.2 mm and WC +.
80Ni-20Cr (WC: Ni-Cr = 1: 2) upper layer film 0.4 mm, 88WC + by jet coating method
12Co film 0.15mm or 88WC + 12Ni-C
The object can be achieved by forming any of the r coating of 0.15 mm and the SUS316 coating of 0.4 mm by the diamond jet method.
【００３２】（例２）本発明を火力、原子力発電プラン
ト用各種弁に適用した実施例について説明する。図４は
仕切り弁に適用した場合、図５は玉形弁に適用した場合
及び図６は逆止弁に適用した場合の各実施例の説明図で
あり、斜線部が本発明の被膜を形成させた部位である。
図４〜図６において、１は弁箱、２は弁座、３は弁体、
４は接続管を示す。(Example 2) An example in which the present invention is applied to various valves for thermal power and nuclear power plants will be described. 4 is an explanatory view of each embodiment when applied to a sluice valve, FIG. 5 is applied to a globe valve and FIG. 6 is applied to a check valve, and a hatched portion forms a coating film of the present invention. It is the part that made it.
4 to 6, 1 is a valve box, 2 is a valve seat, 3 is a valve body,
Reference numeral 4 represents a connecting pipe.
【００３３】なお、本発明の被膜を溶射によって形成す
る場合には、各部品の溶射による組立て完了後に行うの
が望ましく、例えば弁箱１と弁座２との溶接や、弁箱１
と接続配管４との溶接がこれに該当する。このことは溶
射形成された金属又はセラミックス被膜が溶接時の加熱
によって損傷することを防止するためである。When the coating film of the present invention is formed by thermal spraying, it is desirable to perform it after the assembling of each component by thermal spraying is completed. For example, welding of the valve box 1 and the valve seat 2 or the valve box 1 is performed.
Welding of the connection pipe 4 and the connection pipe 4 corresponds to this. This is to prevent the metal or ceramic coating formed by thermal spraying from being damaged by heating during welding.
【００３４】図４〜図６の斜線部は前記例１で説明した
被膜の任意のものが形成され、例１と同様な効果を奏す
る。The shaded portions in FIGS. 4 to 6 are formed of any of the coatings described in Example 1 above, and have the same effect as Example 1.
【００３５】[0035]
【発明の効果】本発明によれば、火力、原子力発電プラ
ントの湿り蒸気系統、給・復水系統、ドレン系統を構成
する炭素鋼製の配管及び各種弁などの機器のエロージョ
ン・コロージョンによる減肉の発生を低コストにて防止
することができる。EFFECTS OF THE INVENTION According to the present invention, the erosion / corrosion of the components such as carbon steel pipes and various valves constituting the thermal power, the wet steam system of the nuclear power plant, the feed / condensate system, and the drain system is reduced. Can be prevented at low cost.
【図１】本発明をエルボに適用した実施例の説明図FIG. 1 is an explanatory diagram of an embodiment in which the present invention is applied to an elbow.
【図２】本発明を分岐管に適用した実施例の説明図FIG. 2 is an explanatory view of an embodiment in which the present invention is applied to a branch pipe.
【図３】本発明をコントロール弁下流側配管に適用した
実施例の説明図FIG. 3 is an explanatory view of an embodiment in which the present invention is applied to a control valve downstream side pipe.
【図４】本発明を仕切弁に適用した実施例の説明図FIG. 4 is an explanatory view of an embodiment in which the present invention is applied to a sluice valve.
【図５】本発明を玉形弁に適用した実施例の説明図FIG. 5 is an explanatory view of an embodiment in which the present invention is applied to a globe valve.
【図６】本発明を逆止弁に適用した実施例の説明図FIG. 6 is an explanatory view of an embodiment in which the present invention is applied to a check valve.
【図７】エロージョン・コロージョン発生のメカニズム
の説明図FIG. 7 is an explanatory diagram of a mechanism of erosion / corrosion generation.
【図８】従来技術によるエロージョン・コロージョン発
生防止対策の作用の説明図FIG. 8 is an explanatory view of the action of the erosion / corrosion occurrence prevention measure according to the conventional technique.
【図９】従来技術によるエロージョン・コロージョン発
生防止対策の作用の説明図FIG. 9 is an explanatory view of the action of the erosion / corrosion generation prevention measure according to the conventional technique.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 土居 与志幸 兵庫県高砂市荒井町新浜二丁目１番１号 三菱重工業株式会社高砂製作所内 (72)発明者 中村 伸 兵庫県高砂市荒井町新浜二丁目１番１号 三菱重工業株式会社高砂製作所内 (72)発明者 石原 学 兵庫県高砂市荒井町新浜二丁目１番１号 三菱重工業株式会社高砂製作所内 (72)発明者 有岡 孝司 兵庫県高砂市荒井町新浜二丁目１番１号 三菱重工業株式会社高砂研究所内 (72)発明者 榧野 勇 兵庫県高砂市荒井町新浜二丁目１番１号 三菱重工業株式会社高砂研究所内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshiyuki Doi 1-1-1, Niihama, Arai-cho, Takasago-shi, Hyogo Mitsubishi Heavy Industries, Ltd. Takasago Plant (72) Inventor Shin Nakamura 2-chome, Niihama, Arai-cho, Takasago-shi, Hyogo No. 1 Mitsubishi Heavy Industries, Ltd., Takasago Plant (72) Inventor Manabu Ishihara 2-1-1, Niihama, Arai-cho, Takasago-shi, Hyogo Prefecture Mitsubishi Heavy Industries Ltd., Takasago Plant (72) Koji Arioka, Niihama, Arai-cho, Takasago-shi, Hyogo Prefecture 1-1-1 Mitsubishi Heavy Industries Ltd., Takasago Research Laboratory (72) Inventor Isamu Kashino 2-1-1-1, Niihama, Arai-cho, Takasago-shi, Hyogo Mitsubishi Heavy Industries Ltd. Takasago Research Laboratory
Claims (4)
統を構成する火力、原子力発電プラント用機器におい
て、流体と接する各機器の表面に系統中を流動する流体
に対して化学的に安定な金属又はセラミックの被膜を形
成してなることを特徴とする火力、原子力発電プラント
用機器。1. A wet steam system, a feed / condensate system, a thermal power constituting a drain system, and a nuclear power plant equipment are chemically stable against a fluid flowing in the system on the surface of each equipment in contact with the fluid. For forming thermal power and nuclear power plants, which is formed by forming a metal or ceramic coating.
合、Ｎｉ−Ｃｒの下層被膜及びＷＣ＋Ｎｉ−Ｃｒの上層
被膜を大気プラズマ溶射により形成してなることを特徴
とする請求項１記載の火力、原子力発電プラント用機
器。2. When the fluid flowing through the system is degassed pure water, the Ni—Cr lower layer coating and the WC + Ni—Cr upper layer coating are formed by atmospheric plasma spraying. Thermal power, equipment for nuclear power plants.
合、ＷＣ＋Ｃｏ又はＷＣ＋ＮｉＣｒの単相被膜を高エネ
ルギガス溶射法であるジェットコート溶射により形成し
てなることを特徴とする請求項１記載の火力、原子力発
電プラント用機器。3. A single-phase coating of WC + Co or WC + NiCr is formed by jet coat spraying, which is a high energy gas spraying method, when the fluid flowing in the system is degassed pure water. The listed thermal power and nuclear power plant equipment.
合、オーステナイト系ステンレス鋼の単相被膜を高エネ
ルギガス溶射法であるダイヤモンドジェット溶射により
形成してなることを特徴とする請求項１記載の火力、原
子力発電プラント用機器。4. When the fluid flowing through the system is degassed pure water, a single-phase coating of austenitic stainless steel is formed by diamond jet spraying which is a high energy gas spraying method. 1. Thermal power and nuclear power plant equipment described in 1.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3061593A JPH05280687A (en) | 1991-03-26 | 1991-03-26 | Apparatus for thermal power plant and nuclear power plant |
| US07/853,050 US5317610A (en) | 1991-03-26 | 1992-03-18 | Device for thermal electric and nuclear power plants |
| EP92400843A EP0511035A1 (en) | 1991-03-26 | 1992-03-26 | Device for thermal electric and nuclear power plants |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3061593A JPH05280687A (en) | 1991-03-26 | 1991-03-26 | Apparatus for thermal power plant and nuclear power plant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05280687A true JPH05280687A (en) | 1993-10-26 |
Family
ID=13175607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3061593A Withdrawn JPH05280687A (en) | 1991-03-26 | 1991-03-26 | Apparatus for thermal power plant and nuclear power plant |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US5317610A (en) |
| EP (1) | EP0511035A1 (en) |
| JP (1) | JPH05280687A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5608766A (en) * | 1993-10-29 | 1997-03-04 | General Electric Company | Co-deposition of palladium during oxide film growth in high-temperature water to mitigate stress corrosion cracking |
| SE509387C2 (en) * | 1996-02-23 | 1999-01-18 | Asea Atom Ab | Component for use in a light water reactor, method for coating the component, and using the same |
| US6128361A (en) * | 1996-03-26 | 2000-10-03 | General Electric Company | Coating for reducing corrosion of zirconium-based alloys induced by . .beta-particle irradiation |
| US20040190671A1 (en) * | 2003-03-26 | 2004-09-30 | Wivagg Adrian P. | Jet pump assembly repair method |
| CN101783191B (en) * | 2009-01-21 | 2012-05-16 | 中国核电工程有限公司 | Super pipeline for nuclear power plant as well as manufacturing method thereof |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE423727B (en) * | 1976-04-08 | 1982-05-24 | Stal Laval Turbin Ab | PROTECTION FOR STALYTOR |
| US4376753A (en) * | 1979-12-20 | 1983-03-15 | Electric Power Research Institute | Corrosion protection system for nuclear power plant |
| JPS5852488A (en) * | 1981-09-21 | 1983-03-28 | Furukawa Kogyo Kk | Anticorrosive valve and joint |
| JPS59104498A (en) * | 1982-12-02 | 1984-06-16 | Toshiba Corp | Valve body structure of control valve |
| CA1232827A (en) * | 1984-04-20 | 1988-02-16 | Yasumasa Furutani | Inhibition of deposition of radioactive substances on nuclear power plant components |
| NO162957C (en) * | 1986-04-30 | 1990-03-14 | Norske Stats Oljeselskap | PROCEDURE FOR THE PREPARATION OF A CHROMO COAT COAT. |
| US4869936A (en) * | 1987-12-28 | 1989-09-26 | Amoco Corporation | Apparatus and process for producing high density thermal spray coatings |
| JPH02129367A (en) * | 1988-11-07 | 1990-05-17 | Sumitomo Metal Ind Ltd | Surface treated steel pipe excellent in corrosion resistance and its production |
| US5057340A (en) * | 1990-04-20 | 1991-10-15 | Westinghouse Electric Corp. | Method of forming a coating on a reactor coolant pump sealing surface |
| US5135709A (en) * | 1991-05-13 | 1992-08-04 | General Electric Company | Method for reducing corrosion of components exposed to high-temperature water |
-
1991
- 1991-03-26 JP JP3061593A patent/JPH05280687A/en not_active Withdrawn
-
1992
- 1992-03-18 US US07/853,050 patent/US5317610A/en not_active Expired - Fee Related
- 1992-03-26 EP EP92400843A patent/EP0511035A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| US5317610A (en) | 1994-05-31 |
| EP0511035A1 (en) | 1992-10-28 |
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